Jamal Khashoggi, a Saudi journalist who had been living in self-exile in U.S. for more than a year, had disappeared last week after entering the Saudi Arabian consulate building in Istanbul.
While Riyadh claimed he had left the building afterwards, Turkish police said Khashoggi did not come out of the consulate.
Khashoggi had written a series of columns for the Washington Post that were critical of Saudi Arabia's assertive Crown Prince Mohammed bin Salman, who has led a widely publicized drive to reform the Sunni monarchy but has also presided over the arrests of activists and businessmen.
"We are aware of the latest reports and are working urgently to establish the facts, including with the government of Saudi Arabia", the representative said.
Kislakci also alleged, based on conversations with officials he did not name, that Khashoggi was made to "faint", then was dismembered.
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Turkey's Foreign Ministry said a search would be conducted there. It remains unclear when the search will take place. Jamal Khashoggi went there to get paperwork so he could marry his Turkish fiancée, and he hasn't been seen or heard from since October 2.
On Monday, Downing Street said the United Kingdom was "working urgently" to establish the facts behind Mr Khashoggi's disappearance. "There are other things we can do", he said.
A Washington Post columnist and prominent newspaper editor in Saudi Arabia, Khashoggi mysteriously vanished last week.
Khashoggi, 59, went missing while on a visit to the consulate in Istanbul for paperwork to marry his Turkish fiancée.
"If we do not show any reaction, we can be the next one disappearing", he added. Afterward, his body was dismembered to hide the killing, they said the probe found.
Trump said that United States economic success was due in part to "what we are doing with our defense systems", and added: "Frankly I think that would be a very, very tough pill to swallow for our country."Investigation continuesTurkish President Recep Tayyip Erdogan told reporters Thursday that Turkey "cannot remain silent" on the disappearance of Khashoggi". Secretary of State Mike Pompeo pushed the Saudis a little harder to sort it out themselves, calling for "a thorough investigation of Mr. Khashoggi's disappearance and to be transparent about the results of that investigation". "We want to find out what happened", Trump told Fox & Friends programme on Fox News on Thursday. But if Khashoggi is dead, the Saudi government certainly had a motive to kill him. Erdogan said, according to Hurriyet daily.
Britain is a close ally and trade partner of Saudi Arabia.
Trump said he and his administration are "looking at it very, very seriously".